Data is transmitted by using continuous frames each of which includes a variable-length part having a length that varies depending on an input period and a fixed-length part containing data of one input period. The transmitted continuous frames are received, a frame period is detected, and data is reproduced based on the detected frame period.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A communication system including a transmitter and a receiver, the transmitter comprising: a first receiving unit constructed to receive continuous data input in a plurality of sampling periods; a sampling period identifying unit constructed to identify a sampling period of the continuous data received by the receiving unit; a generating unit constructed to generate continuous frames from the continuous data received by the receiving unit, each of the frames including a variable-length part and a fixed-length part containing data of one period or n periods or one n-th of one period of the plurality of sampling periods, where n is a positive integer, and each frame length of each of the frames is adjusted to a period equal to one period or n periods or one n-th of one period of the plurality of sampling periods by varying the length of the variable-length part in accordance with the sampling period identified by the sampling period identifying unit; and a transmitting unit constructed to transmit the continuous frames generated by the generating unit, and the receiver comprising: a second receiving unit constructed to receive the continuous frames transmitted by the transmitting unit; a detecting unit constructed to detect a period of the frames received by the second receiving unit; and a reproducing unit constructed to reproduce the data input in the plurality of sampling periods on the basis of the period of the frames detected by the detecting unit, wherein the data contained in the fixed-length part is modulated by using orthogonal frequency division multiplexing.
2. A communication apparatus comprising: a receiving unit constructed to receive continuous data input in a plurality of sampling periods; a sampling period identifying unit identifying a sampling period of the continuous data received by the receiving unit; a generating unit constructed to generate continuous frames from the continuous data received by the receiving unit, each of the frames including a variable-length part and a fixed-length part containing data of one period or n periods or one n-th of one period of the plurality of sampling periods, where n is a positive integer, and each frame length of each of the frames is adjusted to having a period equal to one period or n periods or one n-th of one period of the plurality of sampling periods by varying the length of the variable-length part in accordance with the sampling period identified by the sampling period identifying unit; and a transmitting unit transmitting constructed to transmit the continuous frames generated by the generating unit, wherein the data contained in the fixed-length part is modulated by using orthogonal frequency division multiplexing.
3. The communication apparatus according to claim 2 , wherein the variable-length part contains a signal for synchronizing operation clocks or frequencies relating to modulation and demodulation of the data between the communication apparatus and another communication apparatus.
4. The communication apparatus according to claim 2 , wherein the fixed-length part contains a signal for synchronizing operation clocks or frequencies relating to modulation and demodulation of the data between the communication apparatus and another communication apparatus.
5. The communication apparatus according to claim 2 , wherein the variable-length part does not contain a signal including significant data in transmission of data input in the plurality of sampling periods.
6. The communication apparatus according to claim 2 , wherein the data contained in the fixed-length part is modulated by using orthogonal frequency division multiplexing; the variable-length part is positioned adjacent to an effective symbol or a guard interval obtained by modulating data of one period or n periods or one n-th of one period of the plurality of sampling periods contained in the fixed-length part by using orthogonal frequency division multiplexing, where n is a positive integer; and the variable-length part is a signal in which orthogonality between subcarriers into which data of one period or n periods or one n-th of one period of the input periods is divided is maintained in an interval of a signal including (i) the variable-length part and the effective symbol, or (ii) the variable-length part and the guard interval, or (iii) the variable length part, the guard interval, and the effective symbol, the interval having a length equal to the effective symbol.
7. The communication apparatus according to claim 2 , wherein the data input in the plurality of sampling periods is streaming data; and each of the plurality of sampling periods is equal to a sampling period of the streaming data or longer or shorter than the sampling period by a factor of m, where m is a positive integer.
8. A control method in a communication system including a transmitter and a receiver, the method comprising: at the transmitter, a first receiving step of receiving continuous data input in a plurality of sampling periods; a sampling period identifying step of identifying a sampling period of the continuous data received in the receiving step; a generating step of generating continuous frames from the continuous data received at the receiving step, each of the frames including a variable-length part and a fixed-length part containing data of one period or n periods or one n-th of one period of the plurality of sampling periods, where n is a positive integer, and each frame length of each of the frames is adjusted to having a period equal to one period or n periods or one n-th of one period of the plurality of sampling periods by varying the length of the variable-length part in accordance with the sampling period identified in the sampling period identifying step; and a transmitting step of transmitting the continuous frames generated at the generating step; and at the receiver, a second receiving step of receiving the continuous frames transmitted at the transmitting step; a detecting step of detecting a period of the frames received at the second receiving step; and a reproducing step of reproducing the data input in the plurality of sampling periods on the basis of the period of the frames detected at the detecting step, wherein the data contained in the fixed-length part is modulated by using orthogonal frequency division multiplexing.
9. A method for controlling a communication apparatus comprising the steps of: receiving continuous data input in a plurality of sampling periods; identifying a sampling period of the continuous data received in the receiving step; generating continuous frames from the continuous data received at the receiving step, each of the frames including a variable-length part and a fixed-length part containing data of one period or n periods or one n-th of one period of the plurality of sampling periods, where n is a positive integer, and each frame length of each of the frames is adjusted to having a period equal to one period or n periods or one n-th of one period of the plurality of sampling periods by varying the length of the variable-length part in accordance with the sampling period identified in the identifying step; and transmitting the continuous frames generated at the generating step, wherein the data contained in the fixed-length part is modulated by using orthogonal frequency division multiplexing.
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February 21, 2008
May 22, 2012
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